Please help me

One normal day I  was taking my bike and was reaching the gate my Uncle Mommy younger sister's husband came to visit my house. I thought Mummy's younger sister and He is coming to Lucknow after a year as he is working along with my dad in Abudhabi. He is about 42 years of age with a height about 175 cms.

I stayed for a while to collect the sweets which he have bought and also had some chat for 10-15 minutes and then I told and I was leaving to visit my friends and may go for a film so will visit him later. My mummy was preparing juice for him and told bye to both of them and I left in another 10 minutes while I was riding the bike I got a call from my mom asking when I would return and whether I would be having dinner from outside or not?

I told will reach around 8 pm and will have the food from outside after the call, keeping my mobile back into my pocket and I noticed I have forgot my purse without which nothing would happen as planned I thought of going back to home and take the purse. I came back to home and kept my bike outside the gate thinking I could get the purse and go back quickly while I was getting near the door noticed my uncle have not left as his shoes is there.

And as mummy told she too have not gone for the association meeting since the front door was locked and I thought they would be on the other side of house and went towards the back door of the house and found that too is locked while planning to ring the bell and I just heard some talks from mommy bedroom. I gave my ears to it, and it was like How big it is? And what is it?

Which I was confused  that what happning here and after few seconds and I heard few sounds of mummy like aaahhh and bangle knocking sound and I thought of finding it secretly and planned to see what is hapening inside but I was not able to see inside
plz help me that what was going on that day
extra martial affair